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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A065068 Number of fixed polyominoes with n cells of which no four are equally spaced on a straight line.

Table of values

n a(n)
1 1
2 2
3 6
4 17
5 45
6 114
7 264
8 545
9 1061
10 2070
11 3990
12 7275
13 12556
14 20824
15 33584
16 52753
17 80560
18 119274
19 170168
20 232700
21 306472
22 396580
23 517300
24 688736
25 926816
26 1241720
27 1640968
28 2130448
29 2710356
30 3383596
31 4171788
32 5120776
33 6289760
34 7747928
35 9582196
36 11908872
37 14887792
38 18732340
39 23712492
40 30141180
41 38341172
42 48622328
43 61275752
44 76578628
45 94786504
46 116132688
47 140870564
48 169379536
49 202262720
50 240326780
51 284337040
52 334532714
53 389976092

List of values

[1, 2, 6, 17, 45, 114, 264, 545, 1061, 2070, 3990, 7275, 12556, 20824, 33584, 52753, 80560, 119274, 170168, 232700, 306472, 396580, 517300, 688736, 926816, 1241720, 1640968, 2130448, 2710356, 3383596, 4171788, 5120776, 6289760, 7747928, 9582196, 11908872, 14887792, 18732340, 23712492, 30141180, 38341172, 48622328, 61275752, 76578628, 94786504, 116132688, 140870564, 169379536, 202262720, 240326780, 284337040, 334532714, 389976092]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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